Zoom finder

Details Zoom finder Zoom finder

1991-03-12

1991-10-01

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

354219, 354222, 354225, 359708, G02B 1514, G02B 1318, G03B 1302, G03B 1310

Patent

active

050527878

ABSTRACT:
A zoom finder can be provided which ensures high magnification and satisfactory view-finding without the need to increase the size. A positive lens which is movable along the optical axis is provided closest to the object side. A negative lens which is movable along the optical axis is provided on the eye-side of the positive lens. Zooming may be accomplished by the zoom finder by moving these lenses along the optical axis. A third lens is provided on the eye-side of the negative lens. The third lens is a negative lens which is fixed and has an eye-side surface which serves as a half-mirror. On the other side of this third lens is a parallel planar plate having an optical frame on one surface which indicates the imaging range. The parallel planar plate may be moved in a direction perpendicular to the optical axis in order to compensate for parallax. A fourth lens which is a fixed positive lens is closest to the eye-side.

REFERENCES:
patent: 4834513 (1989-05-01), Nozawa

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